Perhaps you should try some spelling variations:
"dung lam long snippets" » "dung lam code snippets", "dung luan long snippets", "dung tai long snippets", "dung dat long snippets", "dung lam dong snippets", "dung lam nong snippets", "dung lai long snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung lam long snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung lam long snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
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